5NL2

cryo-EM structure of the mTMEM16A ion channel at 6.6 A resolution.


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 6.60 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Starting Model: experimental
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wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

Structural basis for anion conduction in the calcium-activated chloride channel TMEM16A.

Paulino, C.Neldner, Y.Lam, A.K.Kalienkova, V.Brunner, J.D.Schenck, S.Dutzler, R.

(2017) Elife 6

  • DOI: https://doi.org/10.7554/eLife.26232
  • Primary Citation of Related Structures:  
    5NL2

  • PubMed Abstract: 

    The calcium-activated chloride channel TMEM16A is a member of a conserved protein family that comprises ion channels and lipid scramblases. Although the structure of the scramblase nhTMEM16 has defined the architecture of the family, it was unknown how a channel has adapted to cope with its distinct functional properties. Here we have addressed this question by the structure determination of mouse TMEM16A by cryo-electron microscopy and a complementary functional characterization. The protein shows a similar organization to nhTMEM16, except for changes at the site of catalysis. There, the conformation of transmembrane helices constituting a membrane-spanning furrow that provides a path for lipids in scramblases has changed to form an enclosed aqueous pore that is largely shielded from the membrane. Our study thus reveals the structural basis of anion conduction in a TMEM16 channel and it defines the foundation for the diverse functional behavior in the TMEM16 family.


  • Organizational Affiliation

    Department of Biochemistry, University of Zurich, Zurich, Switzerland.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Anoctamin-1
A, B
960Mus musculusMutation(s): 0 
Gene Names: Ano1Tmem16a
Membrane Entity: Yes 
UniProt
Find proteins for Q8BHY3 (Mus musculus)
Explore Q8BHY3 
Go to UniProtKB:  Q8BHY3
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ8BHY3
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 6.60 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 
EM Software:
TaskSoftware PackageVersion
MODEL REFINEMENTPHENIX
RECONSTRUCTIONRELION2

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
European Research CouncilSwitzerland339116
University of ZurichSwitzerlandForschungskredit FK-16-036

Revision History  (Full details and data files)

  • Version 1.0: 2017-06-07
    Type: Initial release
  • Version 1.1: 2017-08-30
    Changes: Author supporting evidence, Data collection
  • Version 1.2: 2018-02-28
    Changes: Source and taxonomy
  • Version 1.3: 2024-05-15
    Changes: Data collection, Database references, Refinement description